Support for charging electrodes for electrostatic filters



Nov. 24, 1953 J. K. BRlxlUs ET AL 2,660,260

SUPPORT FOR CHARGING ELECTRODES FOR ELECTROSTATIC FILTERS Filed Aug. 1o,1951 4L g. @y 4 Arran/vans Patented Nov. 24, 1953 SUPPORT FOR CHARGIN GELECTRODES FOR ELECTROSTATIC FILTERS Jacob K. Brixius, Cleveland, andChristian W.

Savitz, South Euclid, Ohio, assignors to Air- Maze Corporation,Cleveland, Ohio, a corporation of Delaware Application August 10, 1951,Serial N o. 241,306

This invention relates to improvements in a support for chargingelectrodes for electrostatic filters.

One of the objects of the present invention is to improve anelectrostatic lter cell having collectorplates charged with electricityof opposite sign and having upstream therefrom a ne wire chargingelectrode, the improvement consisting of insulator supports for saidcharging electrode substantially outside of the ow of the gaseous streamthrough the lter so as to minimize impedance of the ow.

Another object of the present invention is to charge a fine wireelectrode of the character mentioned in the preceding parapraph solelyby means of a rod Vextending upstream from the collectory plates andhaving no positive physical connection with the electrode.

Still another object of the present invention is to support a pluralityof ne wire charging electrodes from the insulators mentioned above in amanner to hold each electrode taut independently of thek other.

Other objects and advantages of our invention will be apparent from theaccompanying drawings and description and the essential features thereofwill be set forth in the appended claims.

In the drawings,

Fig. 1 is a central sectional View taken along the line I-I of Fig. 2showing a filter cell embodying our invention;

Fig. 2 is a transverse sectional View of the same taken along the line2-2 of Fig. 1;

Fig. 3 is a fragmental view enlarged taken at the lower left-hand cornerof Fig. 1;

Fig. 4 is a fragmental View taken along the line 4-4 of Fig. 3;'whileFig. 5 is a fragmental sectional View taken along the line 5-5 of Fig.2.

While our invention might be incorporated in a number of electrostaticfilter cells, we have chosen to show the same as embodied in a cell ofthe type described and claimed in the copending (Cla 18S-7) applicationof Christian W. Savitz, Serial No.

64,642 led December` 10, 1948 for an Electrostatic Filter, to whichreference may be had for details omitted here.

Reference may be had to our copending application, Serial No. 241,305,iiled August 10, 1951 for another arrangement for supporting andcharging fine wire electrodes upstream from a set of collector plates.

The electrostatic cell shown in Figs. 1 and 2 is like that shown anddescribed in the above mentioned copending application of Savitz in thatit provides a set of grounded collector plates comprising a pair ofoutside plates Il] and a set of inside plates II. These plates are heldtogether by four bolts I2 which extend through cylindrical spacers I3.The side plates I0 have upstream portions Ia bent inwardly to providegrounded electrodes opposite the ne wire charging electrodes as willpresently appear. Another set of charged collector plates I4 arepositioned alternately between and parallel to the grounded plates Idand II. The plates Ill are shorter and narrower than the plates II asclearly shown in Fig. l. The plates' I4 are electrically connected andsupported along their horizontal center line by means of bolts I5.Spacers I6 hold the plates It in proper position. Each bolt I5 issupported respectively by an electrically conducting bracket I'I at therear end andsimilar bracket I8 at the front end. The bracket I'I issupported by insulators I9 which are rigidly secured to the plates I0 bythe screws 20. The bracket I8 is rigidly supported by the insulators 2lwhich in turn are rigidly secured to the side plates IU by means ofscrews 22. The plates II are cut away as indicated at Ha so as to give aproper air gapbetween these grounded plates and the charged bolts I5 andspacers IE5.` l The means for supporting the charging electrodesupstream from the collector plates will now be described. A perforatedplate 23 rigidly connects plates I0 vat the upstream end of the cell.Onthe Vertical center line of the cell, insulators 24 are mounted onplate 23 vnear the top and bottom of the cell respectively. It will benoted that insulators 2li are narrow across the vcell and practically inhorizontal alinement with the V(top and bottomedges of plates I li.Thus, insulators 2i impede stream flow through the cell Very slightly.L-shape brackets 25 and 2t of spring metal are mounted on the downstreamend of each insulator 2d by a screw 2. At the downstream end of eachbracket is a cup-shape depression 28 opening outwardly toward the top orbottom of the cell. A narrow slot 29 extends from each depressionlaterally to the edge of the bracket. An opening 25a in each bracket 25is coaxial with its depressions 28 in brackets 25.

`One or more ne Wire charging electrodes 3i) are supported taut betweenthe pairs of brackets 25 and 2t. Preferably, for reasons stated in theabove mentioned copending application of Savitz, two of these fine wirecharging electrodes are provided. The depressions 28 in brackets 25 and26 are so spaced as to properly position the two electrodes 30 parallelto each other and parallel to the upstream edges of plates I I and I4.Each wire electrode 30 has an enlarged end 30a received in one of thecup depressions 28. The slots 29 permit the positioning of theelectrodes as shownzrrlthe;drawings;V

The manner of. charging thei cell'will now be described. As clearlydescribed in the above mentioned copending 4application of Savitz, a.suitable power pack provides high voltage substantially unidirectionalcurrentto a. bus. bar 31;. Rigidly supported from the cell framebybrackets 32, is an insulator 33. Passing axiallyfoif insulator is aconductor 34 electrically connectedi at one end with the bus balt43ft-.and terminating in a conducting prong 34a. The cell is slidablehorizontally in a frame comprised oi the side members 35, top and bottomplates 36, and frame members 31 at the downstream end. A handle;`

23a, is attached rigidly teeplate 23 for manipulation of the cell. Asthe;V cell. slides into the posi'.- tion: shown in:v Figs;` I and:2,.thefelectrically Qonducting bracket. .I'I' has a recess whchfreceives tightlythe prong; 34a so that, the high; voltageunidirectionalcurrent is transmitted from: the busbar 3l throughconductor 3,4, bracket t1; and bolts f5 and. spacers" Hi tovthe: plates.I4., Atv the forward end:l of the, plates Mi they are electricallyconnected. to the .member tat Tli-readed'inbracket- W isa frodi 3810i`electrically` conducting` material-'with the axis. ofitherod; parallel`to the general direction of airn flow througle thev cell; as indi-cated;by: the arrows.` in lig.` l'. As clearly shown` Figs.V 2 and` 52,.. therod38l isfrictionally engaged between the. fine wire.. electrodes 3Il inamanner is sufcifentto transmitan electrioalcharge from rodi torthe`wires 30. Thus, the wire electrodes-f aresupported and: charged withoutany appreciable interference withu stream fi'owi through thecelli What-we claimist' l. In anf electrostatic filter` cell having a. set.' ofelectriaally charged collector plates; alternately positioned between aset of groundedocollector plategsaid plates-terminating' in upstreamedges generally normally to: thel direction off' -low through said cellof a gaseous'-strear-ny to; be iiitiered, twooutermost plates offsaidsete-f groundplates" extending upstream-*beyond saidset ofchargednplatesr, a frame member connecting the mestreanriL ends or" saidtwo extended plates, insulators rigidly mounted at opposite`vv ends ofsaid frame memberl centrallyoff said celi and extending downstream fromsaid' frame member, said insulators respectivelyh rapprmrirnatel'yopposite tlref-to-p` and bottomed'geso said plates,- a bracket extendingdownstreamf-rorrreach of said electrodes and generally parallel to thedirection of stream flow, at least one of said brackets having springcharacteristics normal to the path of stream ilow, each of said bracketshaving a throughopening centrally ofVA said cell, and there being a slotfrom,l each said openingto an edge of said bracket, a fine wire chargingelectrode supported between said brackets and generally parallel to saidupstream edges, said line wire adapted-to pass through said slots andhaving enlargements on its opposite ends too large to DaSsthrou'gh saidopenings, said enlargements against the outermost faces of saidbrackets'` respectively and to hold said wire in tension' between't saidbrackets, and means for electrically energizing said re wire electrode.

2. The combination of claim 1 including a pair ofAIV said bracketssupported from each of said electrodes, the brackets of each pair beingVparallel', and4 said openings in the outermost bracket of; eachpair of:brackets being spaced from saidA insulators a distance diiering from thespacing of openings-in the innermost bracket of each pair of bracketsso: as to hold two ne wire electrodes in the'. center of said cell andparallel to each other.

3;, In an electrostatic filter cell, a frame memben-insulatorsrigid-ly.` mounted at opposite ends Qi said. frame-member centrally ofsaid cell and extending downstream from said frame member, a bracketextending downstream from each of said, electrodes. andl generallyparallel tothe direction Aof stream ow through said cell, at least one.ofY said' brackets having: spring, characteristi'cs.- normal. to; thepath of stream flow, each o said brackets having a, through opening.Acentrally of said cell, and'. there being' a: slotfrom eacnsaidopenmg fl. to edge of said bracket, a wire" charging electrode supported;between said.bracketsr said-1 fine; wire; adapted t pass tlimzouglrsaid. slots and. having,v enlargements. on its opposite ends too largeto pass through; said openings; enlargements: spaced. to lie againsttheoutermost faces: or said: brackets respe'cilivzely andrto hold; said;wire inK tension betweemsai'tbraekets;

JACOB KBRIX:IUS..

Aira

